The Analog Interface Unit
(AIU) is an hardware device that provides the user of a ProScale
digital measurement system with a method of generating an analog DC
output voltage that is proportional to the currently displayed measurement system position. This output can be used as an A/D
converter input on a PLC or other device that utilizes an analog input
signal.

The AIU uses the SPC output from the
ProScale Readout and converts it to an
internal pre-programmed set of lower and upper position limits. The AIU
uses a ratio utilizing these factors and generates an analog output via
a 12-bit digital-to-analog converter. This provides 4096 discrete
voltage steps over the defined measurement range.